dramatic irony

US /drəˌmæt.ɪk ˈaɪ.rə.ni/
UK /drəˌmæt.ɪk ˈaɪ.rə.ni/
"dramatic irony" picture
1.

a literary device where the audience's or reader's knowledge of events or individuals surpasses that of the characters in the narrative, creating a sense of tension or anticipation.

:
The play uses dramatic irony when the audience knows the killer's identity, but the characters do not.
Shakespeare's tragedies often feature dramatic irony, building suspense for the audience.